Many people would sooner die than think. In fact they do. - B. Russell
Yes. The Starling needs 32-bit.
To err is human, to forgive is very ... dog-like.
If you're talking about the classic desktop on Lucid, yes, it's there, but you choose it during login from a menu on the bottom of the login screen.
If you can do it after you have logged in, I have yet to find it, and wouldn't mind knowing if it's possible.